由于组织遗传性和生产特点,一些贝氏体钢大锻件的奥氏体晶粒难以细化,常出现粗晶、混晶现象。传统上是通过反复重结晶处理的方法来细化晶粒,但效果不明显,且耗能高。本文介绍了采用前处理工艺对贝氏体钢大锻件进行晶粒细化的工艺原理及其应用实例。分析结果说明在重结晶前施行前处理,晶粒细化效果明显,且节省能耗。 Due to the genetic and production characteristics of the organization, some bainitic steel forging austenite grain difficult to refine, often appear coarse grain, mixed crystal phenomenon. Traditionally through repeated recrystallization processing method to refine the grain, but the effect is not obvious, and high energy consumption. This article describes the use of pre-treatment process for bainitic steel forging grain refining process principle and its application examples. The analysis results show that pre-treatment before recrystallization, grain refinement effect is obvious, and save energy.